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Variable Interest Entities (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2021
Mar. 31, 2022
Dec. 31, 2021
VIE primary beneficiary      
Variable Interest Entities [Line Items]      
Variable interest entity, financial or other support, amount   $ 0 $ 0
VIE primary beneficiary | CRC      
Variable Interest Entities [Line Items]      
Percent of proceeds received as cash   75.00%  
Percent of proceeds received as subordinated note   25.00%  
Minimum equity balance required by Cinergy Receivables   $ 3,000,000  
VIE primary beneficiary | DECNCSF | Duke Energy Carolinas      
Variable Interest Entities [Line Items]      
Proceeds from issuance of senior secured bonds $ 237,000,000    
VIE primary beneficiary | DEPNCSF | Duke Energy Progress      
Variable Interest Entities [Line Items]      
Proceeds from issuance of senior secured bonds $ 770,000,000    
VIE not primary beneficiary | VIE With Ownership In Portfolio Of Wind Projects      
Variable Interest Entities [Line Items]      
Variable interest entity ownership interest   50.00%  
VIE not primary beneficiary | OVEC      
Variable Interest Entities [Line Items]      
Variable interest entity ownership interest   9.00%